Method for signaling output subpicture layer set

Abstract

A method, computer program, and computer system is provided for decoding a video sequence. Video information corresponding to one or subpictures within a picture is received and the video information includes at least one output layer set corresponding to one or more output layers and a plurality of flags. A first subpicture is identified from among the subpictures as a region of interest based on the output layer set. The first subpicture corresponding to the region of interest is decoded in a high quality mode from an enhancement layer of the picture and remaining subpictures are decoded in a low quality mode from a base layer of the picture.

What is claimed is: 
     
         1 . A method of video media bitstream generation, the method comprising:
 generating a video bitstream, including:
 receiving video information corresponding to a plurality of subpictures within a picture, the video information including at least one output layer set corresponding to one or more output layers and a plurality of flags, wherein the output layer set includes one or more subpictures from a base layer and one or more subpictures from an enhancement layer; 
 identifying a first subpicture from among the plurality of subpictures as a region of interest according to the output layer set; 
 encoding the first subpicture corresponding to the region of interest in a high quality mode for the enhancement layer of the one or more output layers; 
 encoding remaining subpictures in a low quality mode for the base layer of the one or more output layers; and 
   transmitting the video bitstream including the encoded first subpicture and the encoded remaining subpictures.   
     
     
         2 . The method of  claim 1 , wherein the output layer set includes one or more subpicture identifiers of encoded subpictures in an output layer and profile-tier-level information for the output layer. 
     
     
         3 . The method of  claim 1 , wherein subpictures in the enhancement layer are non-overlapping. 
     
     
         4 . The method of  claim 1 , wherein the plurality of flags includes a first flag indicating whether subpicture partitions are aligned across the one or more output layers. 
     
     
         5 . The method of  claim 1 , wherein the plurality of flags includes a second flag indicating whether subpicture identification values are present in each of the one or more output layers. 
     
     
         6 . The method of  claim 5 , wherein the second flag is a video parameter set subpictures present flag. 
     
     
         7 . The method of  claim 1 , wherein the first subpicture is a picture-in-picture region extracted from the base layer of the video information. 
     
     
         8 . The method of  claim 1 , wherein the video bitstream further includes a video parameter set that includes the at least one output layer set. 
     
     
         9 . The method of  claim 1 , wherein encoding the first subpicture comprises enlarging the first subpicture in the high quality mode. 
     
     
         10 . A non-transitory computer-readable storage medium storing a video bitstream that is generated by a video encoding method, the video encoding method comprising:
 receiving video information corresponding to a plurality of subpictures within a picture, the video information including at least one output layer set corresponding to one or more output layers and a plurality of flags, wherein the output layer set includes one or more subpictures from a base layer and one or more subpictures from an enhancement layer;   identifying a first subpicture from among the plurality of subpictures as a region of interest according to the output layer set;   encoding the first subpicture corresponding to the region of interest in a high quality mode for the enhancement layer of the one or more output layers;   encoding remaining subpictures in a low quality mode for the base layer of the one or more output layers; and   wherein the video bitstream comprises the encoded first subpicture and the encoded remaining subpictures.   
     
     
         11 . The non-transitory computer-readable storage medium of  claim 10 , wherein the output layer set includes one or more subpicture identifiers of encoded subpictures in an output layer and profile-tier-level information for the output layer. 
     
     
         12 . The non-transitory computer-readable storage medium of  claim 10 , wherein subpictures in the enhancement layer are non-overlapping. 
     
     
         13 . The non-transitory computer-readable storage medium of  claim 10 , wherein the plurality of flags includes a first flag indicating whether subpicture partitions are aligned across the one or more output layers. 
     
     
         14 . The non-transitory computer-readable storage medium of  claim 10 , wherein the plurality of flags includes a second flag indicating whether subpicture identification values are present in each of the one or more output layers. 
     
     
         15 . The non-transitory computer-readable storage medium of  claim 14 , wherein the second flag is a video parameter set subpictures present flag. 
     
     
         16 . The non-transitory computer-readable storage medium of  claim 10 , wherein the first subpicture is a picture-in-picture region extracted from the base layer of the video information. 
     
     
         17 . The non-transitory computer-readable storage medium of  claim 10 , wherein the video bitstream further includes a video parameter set that includes the at least one output layer set. 
     
     
         18 . The non-transitory computer-readable storage medium of  claim 10 , wherein encoding the first subpicture comprises enlarging the first subpicture in the high quality mode.